I was stationed at Sira for a long-term stay. And can definitely recommend the accommodation as having a very good price-performance ratio.
Location: It is located in a small side street where it is surprisingly quiet for living in the middle of the cultural centre of Bangkok. From here you can walk 5-10 minutes to the busier streets with bars, or within 20 minutes in any direction to any of the sights. You receive a summary with address and contacts in advance, which makes it really easy to find.
Place: You get the whole top floor of this building, which includes a room, bathroom and small balcony. Everything was clean and there is a washing machine in the common area that you can use for 20 baht. For the price, this offer is really unbeatable for Bangkok. Sira himself is very friendly and always helps you with questions. I would definitely come back.